0.8
Decimal ratio
the portrait decimal value of 4 divided by 5
4 : 5
4:5 Aspect Ratio Calculator
The complete 4:5 reference for Instagram portrait posts, product photography, editorial crops, and mobile-first cards. Calculate width or height instantly, verify common portrait sizes, and generate CSS-ready output for responsive layouts.
Instagram portrait postsProduct imageryMobile feed creatives
8+
Practical sizes
from lightweight drafts to high-resolution feed and print outputs
125%
CSS padding value
the legacy responsive fallback for a 4:5 portrait container
Calculate 4:5 Dimensions
Move between feed-ready portrait sizes, print crops, and CSS-safe output
Use exact 4:5 math for portrait feed posts, ecommerce crops, editorial layouts, and tall cards. Switch calculation modes, convert units, and verify whether an asset is exact 4:5 before publishing.
Enter a known width and the calculator derives the exact matching height.
×
Pixel mode uses the native output dimensions directly.
Quick 4:5 resolutions
Current Output
1080 × 1350 px
The output stays locked to exact 4:5 math, including a CSS padding fallback of 125%.
Ratio
4:5
Decimal
0.8
CSS Padding
125%
Diagonal
1729 px
Switch to verify mode to check whether any existing file, crop, or export is exact 4:5 or only approximate.
Resolution Reference
Common 4:5 resolutions for social, editorial, and portrait workflows
These are the 4:5 sizes most often used in mobile feed design and portrait image delivery. Click any row to load it back into the calculator and continue from a realistic target size.
DRAFT
Draft and lightweight previews
Useful for mockups, internal approvals, low-weight previews, and quick experiments.
FEED
Feed-ready social outputs
The most common production sizes for Instagram portrait posts and feed-first campaigns.
HIRES
High-resolution portrait masters
Larger working files for editorial crops, ecommerce, and premium design handoff.
Why 4:5 Matters
Why 4:5 became one of the most useful portrait ratios on the web
4:5 matters because it strikes a practical middle ground between square and full-screen vertical formats. It gives a portrait image more height than 1:1, which helps it dominate mobile feeds, but it is not as narrow or immersive as 9:16.
That balance is exactly why 4:5 became so important on Instagram and similar feed environments. It feels noticeably larger in the scroll than a square image, while still behaving like a feed post instead of a full-screen story.
For teams shipping social creative, 4:5 is often the working answer when they want stronger mobile presence without redesigning for story or Reel placement. The ratio is large enough to feel prominent and controlled enough to keep typography, products, and faces readable.
From an SEO and content standpoint, 4:5 is also relevant beyond social media. It appears in ecommerce cards, portrait editorial crops, and tall responsive components where a generic square or widescreen image would feel too shallow.
Common Sizes
The 4:5 dimensions people actually publish most often
The best-known 4:5 size is 1080×1350, which became the practical standard for Instagram portrait feed posts. Nearby variations such as 1000×1250 or 1200×1500 behave the same way and are useful when teams want flexibility outside a single platform.
Scaling 4:5 is easy because the relationship never changes: multiply or divide both dimensions by the same factor. That means 800×1000, 1080×1350, 1600×2000, and 2400×3000 all preserve the same frame logic even though they serve different quality tiers.
The most common workflow challenge is not calculation. It is cropping. Many source files start as 3:2 or 4:3, and moving them into 4:5 requires careful trimming at the sides or top and bottom so the subject remains centered and readable in a feed.
Use Cases
The workflows where 4:5 is usually the right portrait answer
4:5 is not a universal portrait ratio, but it is one of the most effective when the destination is a mobile feed, a tall card, or a controlled editorial crop.
📱
Instagram portrait feed posts
4:5 is the classic portrait feed size because it occupies more vertical space than a square image without becoming a full-screen story format.
1080×13501200×1500
🛍️
Product imagery and ecommerce
Portrait product shots often benefit from the extra height of 4:5. The ratio gives space for the item itself while still leaving breathing room for styling and negative space.
1000×12501600×2000
📰
Editorial portraits
Magazine-style portraits and profile photos often feel stronger in 4:5 than in square or widescreen formats. It gives the subject more vertical presence without looking like a phone screenshot.
1200×15002000×2500
💳
Tall responsive cards
On websites and apps, 4:5 works well for article cards, case-study previews, and gallery items that need more visual depth than 1:1 but should remain cleaner than 9:16.
800×10001440×1800
🎯
Paid social creatives
Paid social teams often use 4:5 when they want a portrait ad that still reads well in standard feed placements. It is a safer compromise than forcing every ad into a full-screen vertical layout.
1080×13501200×1500
✂️
Portrait crops from wider masters
If the original photo begins as 3:2 or 4:3, 4:5 is a common portrait destination. It gives a visible mobile advantage while remaining easier to crop into than 9:16.
1000×12501080×13501600×2000
CSS and Layout
Use 4:5 on the web when a portrait card needs more presence
4:5 is useful in interfaces that need a portrait image without committing to a full phone-screen visual. It works especially well for editorial cards, social proof modules, product storytelling, and mobile-first gallery layouts.
In modern CSS, use `aspect-ratio: 4 / 5`. For older fallback techniques, the equivalent padding-top value is 125%, because the height is larger than the width.
The same layout-stability logic applies here as on any SEO-sensitive page. If your containers reserve the correct portrait space before the images load, the design feels more deliberate and the page shifts less.
Height from Width
H = W × (5 ÷ 4) = W × 1.25
Example: 1080 × 1.25 = 1350
Width from Height
W = H × (4 ÷ 5) = H × 0.8
Example: 1500 × 0.8 = 1200
CSS Padding
P = (5 ÷ 4) × 100 = 125%
Used for portrait wrappers when you need a legacy fallback
Feed Logic
More height than 1:1, less than 9:16
A controlled portrait format for feed-first publishing
Copy-ready CSS
Modern `aspect-ratio` plus a padding fallback
.ratio-frame {
aspect-ratio: 4 / 5;
}
.ratio-frame--legacy::before {
content: "";
display: block;
padding-top: 125%;
}
/* Example output size: 1080x1350 */When to Use 4:5
Choose 4:5 when mobile feed presence matters more than strict camera fidelity
4:5 is the right choice when the destination rewards portrait images in a feed context. It is less appropriate when the final layout is square, widescreen, or fully immersive vertical video.
The main advantage of 4:5 is visibility. In social feeds and tall card systems, it gives the image more room to breathe and usually feels more prominent than a square crop.
Its tradeoff is that many source files are not born in 4:5. If you begin with 3:2 or 4:3 photography, converting into 4:5 requires a deliberate crop decision. That is why 4:5 is often a destination ratio rather than the original master.
Good fits for 4:5
- ✓Instagram portrait posts and other feed-first social placements
- ✓Product photography that benefits from extra vertical space
- ✓Editorial portraits and profile-driven storytelling
- ✓Tall responsive cards in design systems
- ✓Paid social creative that needs strong mobile presence
- ✓Portrait crops derived from wider still-photo masters
Poor fits for 4:5
- ×YouTube players and standard 16:9 video delivery
- ×Full-screen Stories, Reels, and Shorts where 9:16 is better
- ×Square systems such as avatars and uniform product grids
- ×Camera-original archiving where preserving the source ratio matters
- ×Legacy presentation and projector workflows
- ×Ultrawide or desktop-first hero media
Comparison
How 4:5 compares with square, vertical, and photography-first ratios
4:5 is easiest to understand in relation to the adjacent formats around it. These comparisons show when 4:5 is the sweet spot and when another ratio is the cleaner answer.
4:5
1080×1350
0.8
Best for: Portrait feed posts, tall cards, product crops
Avoid for: Standard widescreen playback
1:1
1080×1080
1.0
Best for: Square social posts and thumbnails
Avoid for: Portrait-heavy storytelling
9:16
1080×1920
0.563
Best for: Stories, Reels, Shorts, TikTok
Avoid for: Standard feed image layouts
3:2
6000×4000
1.5
Best for: Camera originals and print-friendly photography
Avoid for: Portrait feed-first publishing
4:3
1024×768
1.333
Best for: Tablets, projectors, compact photo workflows
Avoid for: Portrait social emphasis
16:9
1920×1080
1.778
Best for: Video, presentations, desktop-first media
Avoid for: Portrait feed cards
How To
How to Calculate 4:5 Aspect Ratio
- 1
Start with the fixed side
Decide whether your workflow begins from a width or a height. Social design often starts from width, while portrait layout systems sometimes begin from a fixed height.
- 2
Apply the 4:5 formula
To find height from width, multiply the width by 5 ÷ 4. To find width from height, multiply the height by 4 ÷ 5.
- 3
Check the output and CSS values
Use the calculator to confirm the final dimensions, the decimal ratio of 0.8, and the CSS padding fallback of 125%.
- 4
Match the size to the destination
Use 1080×1350 as the safest baseline for Instagram portrait posts, then scale upward or downward depending on quality, file size, and downstream reuse.
- 5
Verify before publishing
If a crop came from a wider original, run it through verify mode before upload so you know whether the final export is exact 4:5 or only approximate.
Frequently Asked Questions
Frequently Asked Questions About 4:5
Is 1080×1350 a 4:5 ratio?
Yes. Divide both values by 270 and the result simplifies cleanly to 4:5. That is why 1080×1350 is such a common Instagram portrait reference size.
Why is 4:5 popular on Instagram?
Because it takes up more vertical space in the feed than a square image while still behaving like a normal feed post rather than a full-screen story.
What CSS padding percentage does 4:5 use?
The classic padding-top value is 125%, because 5 divided by 4 times 100 equals 125. Modern CSS can use `aspect-ratio: 4 / 5` directly.
What is the difference between 4:5 and 1:1?
4:5 is taller. A square image has equal width and height, while 4:5 adds extra height and usually feels more prominent in mobile feeds.
What is the difference between 4:5 and 9:16?
4:5 is less extreme. It is designed for portrait feed publishing, while 9:16 is the immersive full-screen vertical format used by Stories, Reels, Shorts, and TikTok.
Can I crop a 3:2 photo into 4:5?
Yes, and that is a very common workflow. You will usually trim some width or adjust the composition, but 3:2-to-4:5 is a normal social crop path.
Is 1200×1500 a 4:5 ratio?
Yes. Divide both values by 300 and the result is 4:5. It is a flexible higher-resolution alternative to 1080×1350.
How do I maintain 4:5 when resizing?
Scale both dimensions by the same factor or use the direct formulas. If the width changes, multiply it by 1.25 to get the exact matching height.
Keep Exploring
Continue from 4:5 into social, portrait, and crop-planning workflows
🏠
Calculator
Use the main tool for any ratio, unit conversion, and shareable output workflow.
□
1:1 Guide
Compare 4:5 against the classic square format for social and commerce grids.
📱
9:16 Guide
See when a portrait feed crop should become a full-screen vertical format.
📊
Social Media Use Case
Explore broader platform-first ratio planning for feed, story, and campaign assets.
✂️
Crop Preview Tool
Preview how a wider source image behaves before committing to a 4:5 crop.
📖
Social Media Sizes Guide
Read the long-form platform size reference for image and video publishing.
📷
3:2 Guide
Compare a photo-native master ratio against a portrait feed destination ratio.
💻
CSS Aspect Ratio Generator
Generate production-ready aspect-ratio and padding fallback snippets.